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1b70238dca
- Do not generate __meta_server label, since it is unavailable in Prometheus. - Add a link to https://docs.victoriametrics.com/sd_configs.html#kuma_sd_configs to docs/CHANGELOG.md, so users could click it and read the docs without the need to search the corresponding docs. - Remove kumaTarget struct, since it is easier generating labels for discovered targets directly from the response returned by Kuma. This simplifies the code. - Store the generated labels for discovered targets inside atomic.Value. This allows reading them from concurrent goroutines without the need to use mutex. - Use synchronouse requests to Kuma instead of long polling, since there is a little sense in the long polling when the Kuma server may return 304 Not Modified response every -promscrape.kumaSDCheckInterval. - Remove -promscrape.kuma.waitTime command-line flag, since it is no longer needed when long polling isn't used. - Set default value for -promscrape.kumaSDCheckInterval to 30s in order to be consistent with Prometheus. - Remove unnecessary indirections for string literals, which are used only once, in order to improve code readability. - Remove unused fields from discoveryRequest and discoveryResponse. - Update tests. - Document why fetch_timeout and refresh_interval options are missing in kuma_sd_config. - Add docs to discoveryutils.RequestCallback and discoveryutils.ResponseCallback, since these are public types. Side notes: it is weird that Prometheus implementation for kuma_sd_configs sets `instance` label, since usually this label is set by the Prometheus itself to __address__ after the relabeling phase. See https://www.robustperception.io/life-of-a-label/ Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3389 See https://github.com/prometheus/prometheus/issues/7919 and https://github.com/prometheus/prometheus/pull/8844 as a reference implementation in Prometheus
55 lines
1.8 KiB
Go
55 lines
1.8 KiB
Go
package kuma
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import (
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"flag"
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"fmt"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/proxy"
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)
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// SDCheckInterval defines interval for targets refresh.
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var SDCheckInterval = flag.Duration("promscrape.kumaSDCheckInterval", 30*time.Second, "Interval for checking for changes in kuma service discovery. "+
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"This works only if kuma_sd_configs is configured in '-promscrape.config' file. "+
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"See https://docs.victoriametrics.com/sd_configs.html#kuma_sd_configs for details")
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// SDConfig represents service discovery config for Kuma Service Mesh.
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//
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// See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#kuma_sd_config
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type SDConfig struct {
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Server string `yaml:"server"`
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HTTPClientConfig promauth.HTTPClientConfig `yaml:",inline"`
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ProxyURL *proxy.URL `yaml:"proxy_url,omitempty"`
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ProxyClientConfig promauth.ProxyClientConfig `yaml:",inline"`
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// fetch_timeout isn't used, so it isn't defined.
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// FetchTimeout time.Duration `yaml:"fetch_timeout,omitempty"`
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// refresh_interval is obtained from `-promscrape.kumaSDCheckInterval` command-line option.
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// RefreshInterval time.Duration `yaml:"refresh_interval,omitempty"`
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}
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// GetLabels returns kuma service discovery labels according to sdc.
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func (sdc *SDConfig) GetLabels(baseDir string) ([]*promutils.Labels, error) {
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cfg, err := getAPIConfig(sdc, baseDir)
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if err != nil {
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return nil, fmt.Errorf("cannot get API config for kuma_sd: %w", err)
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}
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v := cfg.labels.Load()
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pLabels := v.(*[]*promutils.Labels)
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return *pLabels, nil
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}
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// MustStop stops further usage for sdc.
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func (sdc *SDConfig) MustStop() {
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v := configMap.Delete(sdc)
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if v != nil {
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// v can be nil if GetLabels wasn't called yet.
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cfg := v.(*apiConfig)
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cfg.mustStop()
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}
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}
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